ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME

摘要

A zoom lens includes first, second, and third lens units respectively having negative, positive, and negative refractive powers in this order from an object side to an image side. The lens units move during zooming such that the spacing between adjacent lens units changes, the second and third lens units are positioned on the object side at a telephoto end when compared to a wide angle end, and the third lens unit moves during focusing. A lateral magnification of the second lens unit at the wide angle end, a lateral magnification of the second lens unit at the telephoto end, a lateral magnification of the third lens unit at the wide angle end, a lateral magnification of the third lens unit at the telephoto end, a focal length of the first lens unit, and a focal length of the second lens unit are appropriately set.

主权项

1. A zoom lens comprising a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power in an order from an object side to an image side, the first, second and third lens units moving during zooming such that a spacing between adjacent lens units changes, the second lens unit and the third lens unit being positioned on the object side at a telephoto end in comparison to at a wide angle end, and the third lens unit moving during focusing,
wherein conditional expressions below are met,
2.5<β2t/β2w<4.50.35<(β3t/(β3w)/(β2t/β2w)<0.80−1.0